带阻容负载的能量存储系统建模与稳定性分析

阻容负载提高了能量存储系统阶次,对稳定性不利。为分析其稳定性,建立了降压模式下带阻容性负载的状态空间平均模型、小信号与大信号等效电路模型;通过分析小信号模型进行了系统补偿,提高了稳定裕量;通过大信号模型验证了补偿系统在大扰动下的稳定性。针对Simulink中无理想交直流变压器模块,提出了一种理想交直流变压器模型构造方法,还提出了一种新颖的基于此构造方法的负载参数动态仿真模型,可解决Simulink中动态参数负载仿真困难问题。这里建立的阻容性负载模型精度可与宏模型基本一致,但仿真效率远高于宏模型。

Modeling and Stability Analysis of Energy Storage System with Resistance-capacitance Load

Resistance-capacitance load raises the system order with effects on stability. In order to analyze the stability, the state-space average model and large/small signal equivalent circuits were built. The system was compensated and the margin was improved by analyzing small signal model. And the stability of compensated system under large signal disturbance was verified via large signal model. Because there was no ideal AC/DC transformer available in Simulink, an ideal AC/DC transformer model was proposed, an...